Question

What's the value of x?

Answer 1

x = 15units

Solving steps:

• QS = QT + ST

QS = 16 + 9

QS = 25

• QSR = RST

Cos(QSR) = RS/QS

Cos(QSR) = x/25

Cos(RST) = ST/RS

`(x)/(25) = (9)/(x)`

=>
`x {}^(2) = 225`

=>
`x = √(225)`

=> x = 15